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Mitsubishi

7UEC60LS

Name: Mitsubishi 7UEC60LS
Brand: Mitsubishi
SKU: OSE-38603

The Mitsubishi 7UEC60LS is a 7‑cylinder low‑speed two‑stroke main propulsion engine delivering 14.4 MW at 115 rpm, featuring electronically controlled fuel injection and exhaust valve (ECL) for reliable operation on HFO or MDO.

14420.0 kW

Power

400,000 kg

Weight

Engine Specifications

Cylinders

600 mm

Bore

1900 mm

Stroke

14,420 kW

MCR Power

115.0 rpm

MCR RPM

18.0 bar

MEP

2-stroke

Stroke Type

Family: Mitsubishi UEC (LS/LA/LSE/LSII) · Tier: IMO Tier II · Fuel: HFO, MDO

Inspector Detail

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Designation decoded

Mitsubishi 7UEC60LS – 7-Zylinder, 600 mm Bohrung, 1900 mm Hub, Zweitakt-Kreuzkopfmotor, LS-Baureihe (Low Speed), nockenwellengesteuert

Background

The UEC60LS is a large two-stroke crosshead slow-speed engine of the LS series with 600 mm bore and 1900 mm stroke. With a stroke/bore ratio of 3.17, it belongs to the pronounced long-stroke engines. The given mean effective pressure of 18.0 bar indicates high specific power density. This engine is used in larger cargo ships such as bulk carriers, tankers and container ships. The 7-cylinder configuration at this engine size requires particularly careful torsional vibration monitoring, as the forces and moments occurring are considerable.

Calculated metrics

Stroke To Bore Ratio

3.17

Mean Effective Pressure Bar

18.0

Inspector checklist

Crankshaft and torsional vibration system

Torsionsschwingungsdämpfer – umfassende Zustandsprüfung einschließlich Silikonöl-Viskositätsprüfung
Kurbelwellendurchbiegung an allen 8 Hauptlagern sorgfältig messen
Barred Speed Range – verify limiter switch and documentation
Axial bearing – clearance and bearing shell condition
Main bearing studs – inspect for fatigue and correct preload

Cylinder and combustion chamber

Cylinder liner wear and ovality – perform precise multi-point measurement at 600 mm bore
Piston rings – side clearance and wear height
Piston crown – NDT inspection for thermal cracking (high load at 18 bar mep)
Exhaust valve – valve seat, spindle guide and turning device
Cylinder oil lubrication – verify distribution and dosing

Camshaft and fuel injection system

Camshaft drive – chain elongation, sprocket profile and lubrication
Fuel injection pumps – plunger and barrel under increased load at 18 bar mep
Fuel injection nozzles – opening pressure, spray quality and return quantity
Fuel high-pressure lines for material fatigue and cracks
Einspritz-Timing gemäß Herstellervorgabe verifizieren

Crosshead and running gear

Crosshead bearing – clearance, oil film thickness and bearing shell surface
Connecting rod studs – elongation and hydraulic preload
Piston rod packing – particularly stressed at 1900 mm stroke
Crosshead pin – NDT during overhaul
Slide shoes and guide ways

Turbocharger and air supply

Inspect turbocharger impellers for erosion and deposits
Charge air cooler – cleaning condition and pressure loss
Scavenge air box – cleaning condition and drainage
Turbolader-Nassreinigungssystem auf Funktion prüfen

Sicherheitseinrichtungen

Crankcase oil mist detector – calibration and alarm function test
Explosion flaps – condition and spring preload
Zylinderabblaseventile – Öffnungsdruck kalibrieren
Hauptmotor-Sicherheitsabschaltungen testen

Logbook reference values

Parameter	Expected	Deviation means
Maximaler Zünddruck (Pmax)	140–170 bar (load-dependent, at 18 bar mep)	Bei 18 bar mep sind korrekte Zünddrücke besonders wichtig für die mechanische Belastung – Abweichungen sofort untersuchen
Mittlerer effektiver Druck (mep)	18,0 bar (Nennlast)	Deviations indicate power loss due to compression or combustion deficiencies
Exhaust gas temperature per cylinder	320–400 °C at rated load	Spread >25 °C requires power balancing; individual cylinder rise indicates nozzle or valve problems
Kolbenkühlöl-Austrittstemperatur	42–52 °C	Rise above 55 °C is critical – at 18 bar mep high thermal piston loading
Spülluftdruck	2,0–3,2 bar (lastabhängig)	Insufficient scavenge air pressure reduces scavenging and can lead to overheating at 18 bar mep
Kühlwasser-Austrittstemperatur	80–88 °C	Deviations indicate cooling system faults or thermostat failure
Turbolader-Drehzahl	Gemäß Herstellerangabe (lastabhängig)	Deviating speed at equal load indicates turbocharger fouling or damage
Kurbelwellendurchbiegung	±0,06 mm (kalt) / ±0,08 mm (betriebswarm)	Bei diesem Motorformat sind Grenzwertüberschreitungen sofort zu untersuchen – Fundamentverformung ausschließen

Common Failure Modes

Piston crown crack formation due to high thermal loading

Symptoms: ['Anstieg der Kolbenkühlöl-Temperatur', 'Gasdurchtritt in den Spülluftkasten', 'Ölnebelalarm', 'Zünddruckabfall am betroffenen Zylinder']

Causes: Hoher mep (18 bar) erzeugt erhöhte thermische Belastung, Unzureichende Kolbenkühlölversorgung, Defekte Einspritzdüsen mit Nachtropfen, Abnormale Verbrennungsbedingungen

Preventive: Monitor piston cooling oil temperature closely, plan shorter inspection intervals for pistons at 18 bar mep, prioritize nozzle maintenance

Torsionsschwingungsschäden – Großmotor-spezifisch

Symptoms: ['Schwere Vibrationen im Maschinenraum', 'Rissbildung an Kurbelwangen', 'Beschädigung des Torsionsschwingungsdämpfers', 'Vibration cracks on shaft line and gearbox']

Causes: 7-cylinder excitation at high torques, Betrieb in der Barred Speed Range, Erschöpfung des Torsionsschwingungsdämpfers, Resonanz mit Propelleranregung

Preventive: Strictly adhere to barred speed range, shorten torsional vibration damper overhaul intervals, conduct regular vibration measurements by specialists

Hauptlagerschäden

Symptoms: ['Erhöhte Lagertemperatur', 'Metallpartikel in der Schmierölanalyse', 'Abnormale Kurbelwellendurchbiegung', 'Veränderte Lagergeräusche']

Causes: Unzureichende Schmierölversorgung, Ölverschmutzung, Misalignment due to foundation deformation, Overload at 18 bar mep

Preventive: Regelmäßige Schmierölanalyse, Schmieröldruck überwachen, Kurbelwellendurchbiegung mindestens halbjährlich messen, Fundamentbolzen auf Vorspannung prüfen

Turbolader-Schaufelbruch

Symptoms: ['Plötzlicher Leistungsverlust', 'Schwere Vibrationen am Turbolader', 'Abnormale Geräusche', 'Drastischer Spülluftdruckabfall']

Causes: Erosion caused by catalyst dust in exhaust gas, Hochtemperaturkorrosion, Fatigue fracture due to natural vibrations, Fremdkörpereinschlag

Preventive: Turbolader-Nassreinigung regelmäßig durchführen, Laufradinspektion gemäß Herstellerintervall, Kraftstoffaufbereitung optimieren

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Related components

Turbolader (Laufräder, Lager, Dichtungen, Surging-Schutz) Ladeluftkühler (Reinigung, Druckverlust, Zinkprotektoren) Kraftstoffaufbereitungsanlage (Separatoren, Homogenisierer, Filter) Anlassluft-System (Verteiler, Steuerventile, Druckluftreserve) Exhaust gas boiler and economizer Shaft line, thrust bearing and sterntube Zylinderöl-Dosiersystem Engine foundation and foundation bolts Crankcase oil mist detector and scavenge space fire detector

Classification & regulatory

IACS UR M68 – Barred speed range monitoring mandatory for 7-cylinder engines. Torsional vibration damper overhaul and certification per classification society requirements. Crankshaft deflection to be presented at intermediate and renewal surveys. MARPOL Annex VI – NOx Technical File and EIAPP certificate must be current. At 18 bar mep ensure motor parameters remain within certified NOx limits. IMO Tier compliance to be verified when operating in ECAs.

Reference content for inspector orientation. Always verify against manufacturer's manual, latest service letters and class society requirements.

Other Cylinder Configurations 44

Components & Design

Component data being added…

Technical Data

SFOC (UEC60LSE-Eco-A2) 164-170 g/kWh (IMO Tier II)

BMEP (UEC60LSE) 20.0-21.0 bar @ MCR

Piston speed (UEC60LSE) 8.4 m/s

Dry mass UEC60LSE 8-cyl 447 tons

Dry mass UEC60LSE 5-cyl 300 tons

Bore/Stroke ratio UEC60LSE 4.00

Stroke/Bore UEC68LSE 3.96

Electronically controlled Fuel injection, exhaust valve, cylinder lubrication (ECL)

unified from engine model True

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Common failures & inspection points

Exhaust valve fouling due to sodium/vanadium deposits (Na2SO4, CaSO4, V2O5) with heavy fuel oil containing high sulphur content (up to 5%); below dew point conden

marineengineeringonline.com/main-en...

Turbocharger fouling due to coal and ash particles in exhaust gas during low-load operation, BMEP decline and combustion deterioration

marineengineeringonline.com/fouling...

Piston ring leakage and fuel dilution (>2-3%) due to wear on cylinder running surface/piston rings, increased blowby and oil contamination

www.marineinsight.com/main-engine/e...

Cylinder liner wear due to corrosive combustion with sulphurous fuel oil; inspection criterion: wear according to height of sliding surface, max. permissible

www.goseamarine.com/marine-engine-s...

Main bearing wear due to oil contamination; weekly inspection for water ingress (<2% permissible) and 3-month analysis for wear metals (Fe, Cu) required

www.marineinsight.com/main-engine/e...

Type-general inspection and maintenance points for this equipment category — not model-specific.

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Equipment Model #38603 · ✓ still in production